1076 results about "Base metal" patented technology

The invention relates to the technical field of welding processing, and discloses a dissimilar metal welding joint temperature field optimization control method and system. Real-time temperature field scanning is conducted on the dissimilar metal welded joint, image segmentation processing is conducted on a temperature field image obtained through scanning, temperature data of a weld joint area, a heat affected area and a base metal area are extracted, and whether the temperature gradient exceeds a preset threshold value or not is judged; aiming at an area with non-uniform distribution of heat input quantity, analyzing the performance of the welding joint under the combined action of thermal stress and mechanical stress, obtaining the difference between residual stress distribution and plastic deformation capacity, and analyzing a stress concentration area by combining with the yield strength of the material; and a mapping relation between the welding process parameters and temperature field distribution is established, and a welding process parameter adjustment prediction model is obtained through historical welding process parameters and corresponding temperature field data training in combination with heat flux density distribution. The problems of uneven heat input, stress concentration and the like in dissimilar metal welding are effectively solved, and the welding quality and efficiency are improved.

The invention discloses a preparation method of preheating-welding-free extra-thick steel S355MLO for ocean engineering, and belongs to the technical field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.04%-0.06% of C, 0.15%-0.50% of Si, 1.35%-1.45% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.012%-0.02% of Ti, less than or equal to 0.015% of Al, 0.15%-0.25% of Ni, less than or equal to 0.18% of Cu, less than or equal to 0.18% of Cr, less than or equal to 0.35% of Ceq = [C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15] and the balance of Fe and inevitable impurities. The low-carbon and high-manganese component design is adopted, the S355MLO super-thick steel plate with the maximum thickness of 100 mm is produced through a continuous casting billet, the carbon equivalent Ceq is smaller than or equal to 0.35, and high strength, high toughness and high welding performance are integrated. The base metal and welding toughness of the thick steel plate produced by the TMCP process are improved through the component and inclusion regulation and control technology, the process is simple, the production cost is low, the production efficiency is high, preheating before welding can be avoided, and energy conservation and consumption reduction are achieved.

The invention discloses a production method of 420-grade preheating-free welding maritime work steel, and belongs to the technical field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.04%-0.06% of C, 0.15%-0.50% of Si, 1.45%-1.55% of Mn, less than or equal to 0.008% of P, less than or equal to 0.003% of S, 0.012%-0.02% of Ti, less than or equal to 0.010% of Al, 0.15%-0.25% of Ni, 0.10%-0.18% of Cu, 0.10%-0.18% of Cr, less than or equal to 0.38% of Ceq = [C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15], and the balance of Fe and inevitable impurities. A low-carbon and high-manganese component design is adopted, the S420MLO super-thick steel plate with the maximum thickness capable of reaching 100 mm is produced through a continuous casting billet, the carbon equivalent Ceq is smaller than or equal to 0.38, and high strength, high toughness and high welding performance are integrated. The base metal and welding toughness of the thick steel plate produced by the TMCP process are improved through the component and inclusion regulation and control technology, the process is simple, the production cost is low, the production efficiency is high, preheating before welding can be avoided, energy is saved, consumption is reduced, and the method is environmentally friendly.

The invention discloses 460-grade preheating-free welding maritime work steel and a preparation method thereof, and belongs to the technical field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.04 to 0.06 percent of C, 0.15 to 0.50 percent of Si, 1.75 to 1.85 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.003 percent of S, 0.012 to 0.02 percent of Ti, less than or equal to 0.015 percent of Al, 0.25 to 0.35 percent of Ni, 0.20 to 0.28 percent of Cu, 0.20 to 0.25 percent of Cr and the balance of Fe and inevitable impurities. A low-carbon and high-manganese component design is adopted, the S460MLO super-thick steel plate with the maximum thickness capable of reaching 100 mm is produced through a continuous casting billet, the carbon equivalent Ceq is smaller than or equal to 0.45, and high strength, high toughness and high welding performance are integrated. The base metal and welding toughness of the thick steel plate produced by the TMCP process are improved through the component and inclusion regulation and control technology, the process is simple, the production cost is low, the production efficiency is high, preheating before welding can be avoided, energy is saved, consumption is reduced, and the method is environmentally friendly.

The invention discloses a phased array ultrasonic detection method for anisotropic metal plate weld joints. The phased array ultrasonic detection method comprises the following steps: S1, preparation work before detection; s2, selecting instruments and detection parameters; s3, adjusting the detection system; s4, detection is carried out, wherein base metal detection is carried out on the peripheral area of the metal plate weld joint, and it is ensured that no defect affecting acoustic beam propagation exists in the base metal of the metal plate; s2, according to the instruments and the detection parameters selected in the step S2, scanning all the areas of the weld joint in sequence, and storing scanning detection data; and S5, detection result analysis: analyzing the stored scanning detection data, finding out defect signals, recording corresponding defect information, and correcting the defect information to obtain final accurate information corresponding to the defect signals. According to the method, a large number of calibration test blocks do not need to be manufactured, and the final accurate information corresponding to the defect signal can be obtained only by correcting the found defect information, so that the workload is reduced, and the detection efficiency is improved.

The invention relates to the field of weld joint grinding, in particular to an outer weld joint grinding device for a longitudinal submerged arc welding pipe and robot grinding equipment, and aims to relieve the technical problem that an abrasive belt is prone to excessive grinding in the related technology. The outer welding seam coping device for the longitudinal submerged arc welding pipe comprises a grinding head; the grinding head comprises a triangular fixing frame, a rotating wheel, an abutting wheel, an abrasive belt and a limiting wheel. The number of the rotating wheels is two, and the two rotating wheels and the abutting wheel are all connected with the triangular fixing frame in a pivoted mode and arranged at the corners of the triangular fixing frame respectively so as to be distributed in a triangular mode. The abrasive belt is wound and tensioned on the abutting wheel and the two rotating wheels. The two limiting wheels are arranged on the two sides of the abutting wheel respectively and connected with the triangular fixing frame in a pivoted mode, the rotating axis of each limiting wheel coincides with the rotating axis of the abutting wheel, and meanwhile the diameter of each limiting wheel is larger than that of the abutting wheel. The limiting wheels are arranged on the two sides of the abutting wheel, so that the grinding amount of the abrasive belt is limited, the welding seam strength can be ensured, and meanwhile, pipe body base metal is protected.

The invention provides base metal conductive paste for a photovoltaic cell and a preparation method, a use method and application thereof, and the conductive paste comprises the following components in percentage by mass: 5-60wt% of oxide coated base metal powder, 27-77wt% of silver powder, 2-5wt% of glass powder, 0.1-3wt% of an antioxidant aid and the balance of an organic carrier; wherein the base metal powder comprises one or more of copper, tungsten, tin, nickel, aluminum and alloy powder of the copper, the tungsten, the tin, the nickel, the aluminum and the alloy powder of the aluminum, and the oxide comprises one or more of silicon oxide, aluminum oxide, titanium oxide and boric oxide. The base metal powder coated with a specific type and a proper amount of oxide is selected and matched with the oxide and the glass powder which are good in compatibility, the manufacturing cost of the conductive paste and the battery can be effectively reduced, meanwhile, the conductive paste is applied to TOPCon and BC batteries, and the battery conversion efficiency can be kept equivalent to or even superior to that of traditional pure silver conductive paste.

The invention discloses a terahertz vortex phase plate based on a dumbbell-shaped metasurface. A plurality of metasurface units arranged on the same plane; the metasurface unit comprises a top basic unit metal structure layer, a middle dielectric layer and a substrate metal reflecting surface layer; the top basic unit metal structure layer is of a dumbbell-shaped structure, and the area is smaller than that of the middle dielectric layer and the base metal reflecting surface layer; the positions of all layers of the multiple metasurface units are correspondingly arranged, the phase distribution of the arranged multiple top layer basic unit metal structure layers on the plane meets the vortex beam phase distribution, and a metasurface array with the target topological charge is formed; the metasurface array is a terahertz wave incident plane. On the basis of improving the working efficiency, the metasurface technology and the geometric phase principle are combined, the whole-column arrangement of the terahertz vortex phase plate and the generation of terahertz vortex light beams with different topological charges are completed by designing a reflection type basic unit structure, and then the phase coverage corresponding to the specified topological charges is realized.

The invention discloses a dissimilar metal friction welding interface regulation and control layer and an aluminum steel friction welding method. The dissimilar metal friction welding interface regulation and control layer comprises a micro-texture arranged on the metal surface, paste is laid at the micro-texture, and non-metal substances in the paste are completely volatilized before dissimilar metal metallurgical bonding; the welding method comprises the steps that a microstructure is prepared in a designated area on the surface of a stainless steel plate, Zn-20Al powder and ethyl alcohol are mixed and stirred into paste, then the paste is evenly laid on the microstructure area on the surface of base metal, and then friction stir welding is conducted. A welding joint obtained through the scheme is good in toughness (plasticity) and high in strength, atomic-level tight combination of a joint interface is achieved, the mechanical property of the joint is excellent, the joint is free of air hole and crack defects, the adverse effect of brittle intermetallic compounds on the mechanical property is weakened, the wetting spreading performance and the element diffusion capacity of the interface are enhanced, and the welding quality is improved. The obtained welding joint has a good mechanical embedding characteristic.

The invention relates to a hot-rolled wire rod for a 1960MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after high-carbon components of C-Si-Mn-Cr-B are rolled and spun into a wire rod, the wire rod is subjected to rapid online molten salt isothermal treatment, and the wire rod is subjected to front-section molten salt treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state; the steel wire rod is subjected to rear-section molten salt treatment, the molten salt temperature is reduced, unconverted retained austenite is promoted to be converted into the sorbite structure, meanwhile, isothermal tempering of the structure and fusing of a part of sorbite lamellas are promoted, and finally slow cooling is conducted through a roller way; the microstructure of the hot-rolled wire rod comprises a mixed structure composed of tempered sorbite, ferrite and fused sorbite, the tensile strength is 1305-1355 MPa, the percentage reduction of area is 37%-42%, and the hot-rolled wire rod is used for being used as base metal to manufacture high-strength stranded wires and other application fields and is beneficial to reducing the risk of wire breakage.

A titanium non-stick pan including a pan body. A base material of the pan body being a metal composite plate with a multi-layer composite structure that includes a base metal layer and a titanium metal layer arranged in a stack. The base metal layer is bonded to the titanium metal layer by metallurgical bonding. The titanium metal layer forms a concave-convex structure of a uniform thickness. The concave-convex structure includes a plurality of interconnected concave-convex unit cells, each of which includes first convex parts and a concave part enclosed by the first convex parts. The concave part includes a second convex part disposed in the concave part. The second convex part has a top lower than each first convex part, and a surface of the titanium metal layer at the concave-convex structure forms an oxidation layer with a thickness between 8 μm and 40 μm.

The invention relates to the technical field of brazing, in particular to a brazing production line for radiator fin machining and a welding process thereof.The brazing production line comprises a plasma spot welding module and a brazing furnace, and brazing flux spraying equipment and drying equipment are sequentially arranged between the plasma spot welding module and the brazing furnace; a production line conveying belt is arranged in the plasma spot welding module, the brazing flux spraying device, the drying device and the brazing furnace and used for conveying radiator fins. The brazing filler metal in the radiator fins is melted in the welding bin, then the radiator fins are driven to vibrate in the promoting bin, and therefore when the liquid brazing filler metal flows into base metal gaps, the constraint of surface tension can be broken through moderate vibration.

The utility model discloses a marine lean leveling tool for segmented welding. The marine lean leveling tool comprises a flat-bulb steel leveling device, a T-shaped profile leveling device and an angle steel leveling device, the three devices are optimized, so that the use is more convenient, the original limitation is overcome, and the requirements of an actual production field are met; the three devices achieve leveling and butt joint of steel plates such as flat-bulb steel, T-shaped profiles and angle steel on a ship body, plate stacking and folding are omitted, steel structures in the steel plates are not damaged, base metal is protected, operation is easy, a large number of welding materials and polishing working hours are saved, working efficiency is improved, and the working environment of workers is improved; the tool is long in service life and convenient to disassemble and maintain, the work efficiency is improved, the hull structure is effectively protected, and all leveling work can be completed through single-person operation.

The invention discloses a surface treatment process of a hydraulic rod and a coating monitoring system, relates to the technical field of electroplating, and aims to solve the problems that various complementary sensing technologies cannot be integrated, information such as thickness, uniformity and microstructure cannot be synchronously acquired in a lossless, in-situ and real-time manner, and closed-loop control cannot be formed based on the information in the background technology. According to the scheme, the method comprises the steps that PR electrolytic degreasing is conducted, a workpiece serves as an anode, an oil film is torn through the oxygen evolution effect, an extremely-thin oxidation film possibly existing on the surface of the workpiece is dissolved, base metal is completely activated, and an optimal combination basis is provided for a follow-up coating; and washing with hot water, namely removing residual alkaline degreasing fluid and emulsified oil stains by using hot water with the temperature higher than 60 DEG C in a stirring and spraying manner. According to the method, multi-dimensional information such as the thickness, the uniformity and the microstructure can be synchronously obtained in a lossless, in-situ and real-time mode in the surface treatment process, closed-loop control is formed based on the information, and it is ensured that plating growth is always located on the optimal track.

A control system employs model-based multivariable predictive control for cold rolling mills to improve plate thickness uniformity to meet or exceed flatness specifications. Compared with a traditional control method using PID (Proportion Integration Differentiation)-based closed-loop control, the deviation between the thickness and the flatness of the metal plate and the standard requirement is obviously reduced, and meanwhile, the control precision is improved. The control system is particularly suitable for controlling the four-roller irreversible single-base metal rolling mill. The rolling mill base has a first working roll and a second working roll positioned between a first support roll and a second support roll, respectively. The plurality of sensors measure and acquire characteristic data of the material plate. A model predictive controller manipulates the actuators to adjust thickness and flatness. When rolling a metal sheet, the controller performs automatic specification control (i.e., machine direction metal control) and automatic flatness control (i.e., lateral metal sheet control).

The invention relates to the technical field of composite material and metal connection, in particular to a carbon / carbon composite material, a modification method and a nickel-based high-temperature alloy brazing method thereof, a SiC coating and a Mo-Si coating are sequentially embedded and sprayed on the carbon / carbon composite material, and a SiC-MoSi composite coating is formed on the surface of the carbon / carbon composite material through high-temperature heat treatment curing. Due to the existence of the SiC-MoSi composite coating, a CTE transition layer is provided for a connector, residual stress caused by thermal expansion difference is reduced, conditions for generating Mo-based compounds are created, wettability and interface bonding strength of brazing filler metal and base metal can be improved, interface reaction of the base metal can be optimized, a uniform and continuous brazing layer is formed, and the service life of the brazing filler metal is prolonged. Therefore, the brazed connection is higher in strength and more stable, and is more suitable for connection of large-size components and service under the high-temperature condition. The problems that in the prior art, the connection performance of a carbon / carbon composite material and dissimilar metal is poor, and failure is prone to occurring are solved.

The invention provides a stainless steel ultra-thick plate laser welding method and device, and the method comprises the steps that a to-be-welded end face of ultra-thick stainless steel is subjected to groove machining, the groove form is a combined form of a large truncated edge and a U-shaped groove, with the groove as a boundary, one end is a first base material, and the other end is a second base material; placing the workpiece according to a corresponding welding method, tightly butting the first base metal and the second base metal, fixing by using a clamp, and then cleaning a to-be-welded surface; the relative positions of the laser beam and the protective gas hood and the base metal are adjusted according to parameters required by the process, and a welding path is programmed or demonstrated; setting welding process parameters; and opening a protective gas valve, starting welding after the welding area is filled with protective gas, and performing front welding, back welding or front and back cover welding. The method can be used for penetration welding of stainless steel super-thick plates or backing welding of deep-groove and thick-truncated-edge super-thick plates, the welding efficiency can be remarkably improved, welding deformation is reduced, and the post-welding machining allowance of high-precision products is reduced.

The utility model discloses a production device of a layered silver-based metal oxide contact material, which comprises a discharging mechanism, an atmosphere protection resistance furnace, a rolling mill, an atmosphere protection cooling device, a limiting device and a winding machine, and the atmosphere protection resistance furnace is divided into a resistance furnace middle section, a resistance furnace front section and a resistance furnace rear section. The resistance furnace middle section is connected with an external non-reducing and non-combustible gas conveying device, the resistance furnace front section and the resistance furnace rear section are both connected with the external non-reducing and non-combustible gas conveying device, and the atmosphere protection cooling device is divided into a cooling device middle section, a cooling device front section and a cooling device rear section. The cooling device middle section is connected with an external non-reducing combustible gas conveying device, and the cooling device front section and the cooling device rear section are both connected with the external non-reducing combustible gas conveying device. The layered silver-based metal oxide contact material which is firm in composite interface bonding, low in cost and stable and reliable in quality can be prepared.

The invention discloses an annular furnace heat-resistant supporting forged chassis and an additive manufacturing process and a fixing device thereof, and belongs to the technical field of plating of metal materials, and the annular furnace heat-resistant supporting forged chassis comprises the steps that heat-resistant alloy steel base metal with specific components is prepared; carrying out laser texturing and nickel-based alloy bottom layer pretreatment on the surface of the steel plate; performing laser cladding on high-silicon high-temperature alloy powder containing niobium and rare earth elements to form a functional cladding layer, and performing gradient cladding on the edge of the atmosphere guide hole; and finally, carrying out heat treatment and assembling with a fan-shaped refractory brick fixing device. A composite oxide film and a multi-scale strengthening system are constructed, hydrogen resistance and brittleness resistance are effectively achieved, interface thermal stress is relieved, cracking and stripping of a cladding layer are avoided, a fixing device adapts to thermal expansion, the atmosphere is dredged, and the annealing uniformity of a steel coil is improved; the problems of creep deformation, hydrogen embrittlement, cladding layer stripping and thermal stress cracking of a traditional supporting component under the conditions of high temperature, heavy load and nitrogen and hydrogen atmosphere are solved.

The invention discloses an electrochemical separation and recovery method for multiple metals. The method comprises the following steps: providing an electrolytic bath with a cation exchange membrane; the electrolytic cell is divided into a cathode chamber and an anode chamber by the cation exchange membrane; providing a cathode and an anode; preparing an electrolyte solution; placing a multi-metal-containing thiosulfate leachate, a chlorate and an anode in the anode chamber, and placing the electrolyte solution and a cathode in the cathode chamber; and voltage is applied to the cathode and the anode, and after the reaction is completed, base metal deposited on the cathode and precious metal deposited on the anode are recycled respectively. The electrolysis device provided with the cation exchange membrane is adopted, precious metal complex ions and other metal ions are separated and stored in different electrolysis chambers under the action of an electric field, precious metal is recycled at the anode and other metal is recycled at the cathode by further combining chemical and electrochemical actions, and the separation and purification process of the metal recycling process can be shortened.

The invention discloses a B-type sleeve welding control system and method, and belongs to the technical field of welding automation, and the B-type sleeve welding control system comprises a welding trolley, a welding gun, a visual perception unit and a control unit. By constructing a composite sensing system combining laser vision, molten pool recognition and welding gun sounding calibration, continuous and effective positioning in a narrow space in the sleeve under the condition that multiple layers of welding beads cover layer by layer is achieved. A welding gun is used for conducting welding wire penetration detection in a set coordinate system, space point positions are recorded in real time when the end of a welding wire makes contact with a sleeve and a base metal entity, self-adaptive correction of a welding bead starting point and a swing center is achieved, the positioning precision in the welding process of multiple layers of welding beads is greatly improved, and reliable reference is provided for follow-up path planning of the welding beads. A multi-sensor fusion algorithm is adopted, parameters such as the swing amplitude, the swing frequency, the welding height and the walking speed in the welding process are adjusted in real time, and the forming quality consistency of multiple layers of welding seams can be guaranteed.

The invention belongs to the technical field of welding, and discloses and provides a maritime work steel high-performance non-preheating welding process determination method which comprises the following steps: acquiring a first cold crack sensitivity index required by non-preheating welding at a specific temperature and a critical constraint distance and a critical constraint degree of a base metal sample; obtaining the minimum diffusible hydrogen content of a welding material required in non-preheating welding, and selecting an actual welding material based on the minimum diffusible hydrogen content; the cold crack sensitivity coefficient of the base metal sample is used for optimizing the carbon equivalent of the base metal sample to obtain a new base metal; a second cold crack sensitive index smaller than the first cold crack sensitive index is obtained, and the new base metal corresponding to the second cold crack sensitive index serves as actual base metal; and the time t100 when the peak temperature of the actual welding material and the actual base metal after welding is cooled to 100 DEG C under different welding heat inputs and the critical cooling time tcr of the welding joint are obtained, and the welding heat input when the difference value between t100 and tcr is the maximum serves as the actual welding heat input. A quantitative analysis theory system is provided for developing the welding process, orthogonal tests are avoided, and the method is high in universality.

The invention belongs to the technical field of submerged arc welding, and discloses a high-speed submerged arc welding method and system. In the submerged-arc welding process, special waveform control is adopted, that is, periodic voltage amplitude control is adopted for the welding voltage, cyclic control is conducted between the high-voltage period and the low-voltage period, and electric arcs in the high-voltage state and the low-voltage state repeatedly act on the combination position of the two base materials; and meanwhile, the welding current and the welding voltage are kept to have the same change trend. In the high voltage period, a rotating jet flow transition mode is adopted to blow away molten metal to expose unmolten base metal, meanwhile, the metal side wall of a molten pool is supported, the shape of the molten pool is kept, and electric arcs are stabilized; in the low-voltage period, a large-drop-shaped transition mode is adopted, the top end of the welding wire is lower than the base metal, and the bottom of the base metal is heated to increase the fusion depth. According to the invention, thick plate welding can be carried out by combining a welding wire with a smaller diameter with a general welding flux, and the method has the advantages of high wire feeding speed, increased penetration depth, narrowed weld bead, improved welding quality and the like.

A nickel-based single-crystal high-temperature alloy brazing repair material comprises first brazing filler metal and second brazing filler metal, the first brazing filler metal comprises brazing powder, and the second brazing filler metal comprises evenly-mixed brazing powder and base metal powder which is the same as a part material to be repaired; the brazing powder comprises, by weight, 8%-18% of Cr, 3%-12% of Co, 1%-6% of W, 1%-6% of Ta, 2%-6% of Al, 1%-5% of B, not more than 4% of Mo, not more than 5% of Hf, not more than 3% of Re and the balance Ni and inevitable impurities. The weight ratio of the brazing powder in the second brazing filler metal is 5%-50%. The repair material can effectively perform brazing repair on a large-size gap of 0.25 mm or above. The invention further provides a nickel-based single crystal high-temperature alloy brazing repair method.

The invention discloses a method for realizing low-temperature diffusion bonding of zirconium and alloy thereof based on a constant-current electric field, and relates to the technical field of material bonding. The method aims at solving the problems that in current direct diffusion bonding of zirconium and zirconium alloy, the joint strength is low at the low bonding temperature, and base metal performance is reduced and post-welding deformation is large at the high bonding temperature. According to the method, hole closing and atomic diffusion at a diffusion connection interface are jointly promoted mainly through the electromigration effect under the action of the constant-current electric field, the vacancy concentration of zirconium and the alloy thereof improved by the constant-current electric field, and high-temperature plasticity, so that the high-strength zirconium and the alloy connector thereof are obtained at low temperature. The method for realizing low-temperature diffusion bonding of the zirconium and the zirconium alloy under the action of the constant-current electric field can be obtained.

The invention provides an ultra-low carbon duplex stainless steel all-position welding flux-cored wire and a welding method thereof.The outer skin of the flux-cored wire is a stainless steel strip, the flux-cored wire is filled with powder, and the powder comprises, by mass, 18-25% of natural rutile, 20-30% of stainless steel powder, 20-30% of stainless steel powder, 20-30% of stainless steel powder and the balance stainless steel powder. 3-5% of sodium titanate; 5-10% of quartz sand; 0.5 to 4 percent of zircon sand; 1-3% of sodium fluoride; 15 to 25 percent of ferromolybdenum; 3-6% of nitrided ferrochrome; 2-4% of electrolytic manganese; 5-8% of nickel powder; 27 to 32 percent of metal chromium; 0.5-2% of magnesium powder; 0.5 to 1.5 percent of bismuth oxide; and 1-4% of silicon iron. The flux-cored wire is used for all-position welding of third-generation duplex stainless steel, welding spatter is small, and weld joint forming is good; the carbon content of a weld joint is extremely low, and through component and welding process control, weld joint metal has strength, plasticity, toughness and corrosion resistance equivalent to those of base metal. And the double requirements of high strength and toughness and high corrosion resistance in the manufacturing fields of submarine pipeline laying, shipbuilding, marine gas field exploitation and the like are ensured.

The invention relates to the technical field of adsorbents, and discloses a ZIF-8-coated Cu-BTCMOF composite material as well as a preparation method and application thereof, and the structure of the ZIF-8-coated Cu-BTCMOF composite material is that a zinc-based metal organic framework is loaded on the surface of a copper-based metal organic framework. The composite material provided by the invention has better iodine adsorption capacity on the basis of better water stability.

The invention discloses a plate shape control method for a precipitation-hardening martensite SUS630 stainless steel cold-rolled steel strip. The technical problem that the plate shape of the steel strip is difficult to control is solved. The plate shape control method comprises the following steps that S1, hot rolling, annealing and acid pickling are conducted on a steel strip, the thickness of the steel strip is controlled to be 5.0-6.0 mm, and the width of the steel strip is controlled to be 900-2100 mm; s2, 304 stainless steel leading belts matched with the base metal in width and thickness are welded to the head and the tail of the steel coil correspondingly; s3, cold rolling is conducted on the steel strip through a rolling mill; and S4, the steel strip is corrected through a withdrawal and straightening machine, and the finished steel strip is obtained. According to the method, effective control over the plate shape can be achieved, it is guaranteed that the plate shape of the SUS630 cold-rolled, annealed and pickled steel strip is straight, the unevenness of the plate is smaller than or equal to 3 mm after the plate is flattened, and the use requirement of the steel strip is met.

The invention relates to 780 MPa grade wheel steel and a manufacturing method thereof. The technological process comprises the steps of KR molten iron desulphurization, converter smelting, argon blowing, LF refining, RH vacuum treatment, continuous casting blank forming, plate blank heating, rolling, cooling and coiling. According to the method, the economical titanium alloy is adopted, precipitation strengthening of Ti is not used for improving the strength of base metal, and solution strengthening and structure strengthening are used for enabling the strength performance of the material to meet the requirement; meanwhile, the process that the front section is rapidly cooled to the medium-low temperature to be coiled is adopted, precipitation of Ti is inhibited, precipitation of TiC is inhibited, growth of columnar crystals is inhibited, the Ti element in the steel in a solid solution mode can be reserved, most of Ti in the material is inhibited by the high cooling speed and the low cooling stopping temperature, and the Ti is still in a solid solution mode and not precipitated in base metal; the Ti element is re-precipitated in the welding stage to the user side, and the strength and hardness of the welding heat affected zone and the welding seam are improved by re-precipitation strengthening of the Ti element in the process, so that the softening phenomenon of the welding heat affected zone and the welding seam can be avoided.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.